linux-kernel - Re: [PATCH 10/10] mm: per device dirty threshold

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Message-Id: <1177343900.26937.6.camel@twins>
Date:	Mon, 23 Apr 2007 17:58:20 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Christoph Lameter <clameter@....com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, miklos@...redi.hu, neilb@...e.de,
	dgc@....com, tomoki.sekiyama.qu@...achi.com, nikita@...sterfs.com,
	trond.myklebust@....uio.no, yingchao.zhou@...il.com
Subject: Re: [PATCH 10/10] mm: per device dirty threshold

On Mon, 2007-04-23 at 08:48 -0700, Christoph Lameter wrote:
> On Sat, 21 Apr 2007, Peter Zijlstra wrote:
> 
> > > > This is enormously wrong for CONFIG_NR_CPUS=1024 on a 2-way.
> > 
> > Right, I knew about that but, uhm.
> > 
> > I wanted to make that num_online_cpus(), and install a hotplug notifier
> > to fold the percpu delta back into the total on cpu offline.
> 
> Use nr_cpu_ids instead. Contains the maximum possible cpus on this 
> hardware and allows to handle the hotplug case easily.

Ooh, thats handy... /me ditches the hotplug code again.
That is, unless its very common to have half empty boxens.. ?

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